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Heimer vs Minder: catalog facts
Heimer	Minder
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free and open source under the GPL-3.0-or-later licence.
Windows, Linux	Linux
Supports automatic layouts and image exports.	Fast keyboard-driven map creation Automatic layout of nodes
It is a diagramming tool rather than a full document editor.	Linux only Designed primarily around elementary OS
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-or-later
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.